An integer randomly turns negative

Question

The code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int n = 100;
int num1 = 1;
int num2 = 1;
int num3 = num1 + num2; //2
int A = 0;
while (A < n-3)
{
num3 += num2; //3
num2 = num3 - num2;//2
A++;
//test Console.WriteLine("num2: "+ num2);
//test Console.WriteLine("num3: "+ num3);
//test Console.WriteLine("");
}
}
}
}
after 44 times that the loop is executed the num3 integer just turns negative....

Answer 1

And your doubt ?